Square Feet to Cubic Yards Calculator
Convert square footage and material depth into cubic yards.
Conversion Formula
Cubic yards = square feet × depth in inches ÷ 324.
How to Convert Square Feet and Depth to Cubic Yards
To estimate volume from area, multiply the square footage by the material depth in feet to get cubic feet, then divide by 27 to convert cubic feet to cubic yards. This method is useful for soil, mulch, gravel, concrete and similar bulk materials.
Volume Example
A 900 ft² area covered 4 inches deep uses a depth of 0.333 ft. Multiplying gives about 300 cubic feet, or roughly 11.1 cubic yards before adding any extra allowance.
Why Depth Accuracy Matters
Small changes in depth can materially change the volume on large areas. Measure several locations when the ground is uneven and use the average depth for a more realistic estimate.
Frequently Asked Questions
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard.
Do I need to convert inches to feet first?
Yes. Divide inches by 12 before multiplying by square feet.
Should bulk material be rounded up?
Usually yes, especially when suppliers sell in fixed increments or compaction is expected.
Calculation Assumptions and Practical Limits
Converting area and depth to cubic yards requires both measurements to represent compatible dimensions. Because project depth is often entered in inches, convert it to feet before calculating cubic feet, then divide by 27 for cubic yards.